added sharing docs

Sharing.md

@@ -0,0 +1,66 @@
+Since v0.49 Trilium offers a feature to share selected notes as publicly accessible read only documents.
+
+Basic prerequisite for this feature is to have a [[server installation]] - this is where the notes will be hosted from.
+
+## Share note
+
+Click on the "shared" switch, URL appears on which you can click.
+
+![](images/share-single-note.png)
+
+And this is the opened link:
+
+![](images/share-single-note-web.png)
+
+The URL refers to the localhost (127.0.0.1) because there's no configured sync server.
+
+## Share a note subtree
+
+Sharing a note actually shares a whole subtree of notes, the note shown above just didn't have any children.
+
+If I share the whole "Formatting" subtree then the page looks like this:
+
+![](images/share-multiple-notes-web.png)
+
+You can see a basic navigation on the right. With this you can create small websites.
+
+## Advanced options
+
+### Styling the shared notes
+
+The default shared page is pretty rudimentary. In case you want to style it more nicely you can:
+
+* add a `~shareCss` relation to a CSS code note which will be linked in the shared page
+  * in case you want this to apply to the whole subtree, don't forget to make the label inheritable 
+  * the linked CSS code note needs to be also in the shared subtree. If you want to hide it from left tree navigation, add `#shareHiddenFromTree` label to the CSS code note.
+* if you make extensive styling changes then it's recommended to use `#shareOmitDefaultCss` on the shared subtree so that you don't need to override default stylesheet (this will also avoid problems in the future when the default CSS changes).
+
+### Creating human-readable URL aliases
+
+Shared notes are accessible using URLs like `http://domain/share/knvU8aJy4dJ7`, where the last part is note's ID.
+
+You can add `#shareAlias` to individual notes to make the URLs nicer, e.g. `#shareAlias=highlighting` will make the URL look like `http://domain/share/formatting`.
+
+Note that you are responsible for keeping the aliases unique.
+
+### Seeing all shared notes
+
+All shared notes are grouped under automatically managed "Share Notes" note. Besides seeing what's shared, you can also effectively share/unshare notes by cloning/moving them from/to this note.
+
+![](images/shared-list.png)
+
+## Limitations
+
+Shared notes functionality is compared to standard functionality very limited.
+
+The not exhaustive list of **what is missing** is:
+
+* math support
+* mermaid support
+* relation map support
+* scripting
+* book notes show only children note list
+* code notes have no highlighting
+* note tree is static
+
+Some of these limitations might be removed/mitigated in the future.

_Sidebar.md

@@ -45,6 +45,7 @@
   * [[Relation map]]
   * [[Link map]]
   * [[Book note]]
+  * [[Sharing]]
   * [[Code notes]]
     * [[Scripts]]
     * [[Script API]]
@@ -56,4 +57,4 @@
     * [[Weight Tracker]]
     * [[Task Manager]]
 * [[FAQ]]
-* [[Troubleshooting]]
+* [[Troubleshooting]]